Re: [PATCH v4 4/4] pmbus: ltc2978: add regulator support

[atull]

On Wed, 1 Oct 2014, Guenter Roeck wrote:

> On Wed, Oct 01, 2014 at 03:18:20PM -0500, atull@xxxxxxxxxxxxxxxxxxxxx wrote:
> > From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
> > 
> > Add simple on/off regulator support for ltc2978 and
> > other pmbus parts supported by ltc2978.c
> > 
> > Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
> > 
> > v2: Remove '#include <linux/regulator/machine.h>'
> >     Only one regulator per pmbus device
> >     Get regulator_init_data from pdata or device tree
> > 
> > v3: Support multiple regulators for each chip
> >     Move most code to pmbus_core.c
> >     fixed values for on/off
> > 
> > v4: fix a #endif comment
> >     simplify probe code, remove added switch statement
> >     remove BUG_ON(), add error message and fix num_regulators
> > ---
> >  drivers/hwmon/pmbus/Kconfig   |    7 +++++++
> >  drivers/hwmon/pmbus/ltc2978.c |   37 +++++++++++++++++++++++++++++++++++++
> >  2 files changed, 44 insertions(+)
> > 
> > diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> > index 6e1e493..79117b7 100644
> > --- a/drivers/hwmon/pmbus/Kconfig
> > +++ b/drivers/hwmon/pmbus/Kconfig
> > @@ -56,6 +56,13 @@ config SENSORS_LTC2978
> >  	  This driver can also be built as a module. If so, the module will
> >  	  be called ltc2978.
> >  
> > +config SENSORS_LTC2978_REGULATOR
> > +	boolean "Regulator support for LTC2974, LTC2978, LTC3880, and LTC3883"
> 
> We will need to update this and SENSORS_LTC2978 and add LTC2977 as well as
> LTM4646 to the list of supported chips.
> 
> Guenter

OK

Alan

> 
> > +	depends on SENSORS_LTC2978 && REGULATOR
> > +	help
> > +	  If you say yes here you get regulator support for Linear
> > +	  Technology LTC2974, LTC2978, LTC3880, and LTC3883.
> > +
> >  config SENSORS_MAX16064
> >  	tristate "Maxim MAX16064"
> >  	default n
> > diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
> > index e24ed52..422712e 100644
> > --- a/drivers/hwmon/pmbus/ltc2978.c
> > +++ b/drivers/hwmon/pmbus/ltc2978.c
> > @@ -22,6 +22,8 @@
> >  #include <linux/err.h>
> >  #include <linux/slab.h>
> >  #include <linux/i2c.h>
> > +#include <linux/regulator/driver.h>
> > +#include <linux/regulator/of_regulator.h>
> >  #include "pmbus.h"
> >  
> >  enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };
> > @@ -374,6 +376,30 @@ static const struct i2c_device_id ltc2978_id[] = {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, ltc2978_id);
> >  
> > +#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
> > +static const struct regulator_desc ltc2978_reg_desc[] = {
> > +	PMBUS_REGULATOR("vout_en", 0),
> > +	PMBUS_REGULATOR("vout_en", 1),
> > +	PMBUS_REGULATOR("vout_en", 2),
> > +	PMBUS_REGULATOR("vout_en", 3),
> > +	PMBUS_REGULATOR("vout_en", 4),
> > +	PMBUS_REGULATOR("vout_en", 5),
> > +	PMBUS_REGULATOR("vout_en", 6),
> > +	PMBUS_REGULATOR("vout_en", 7),
> > +};
> > +
> > +static struct of_regulator_match ltc2978_reg_matches[] = {
> > +	{ .name = "vout_en0" },
> > +	{ .name = "vout_en1" },
> > +	{ .name = "vout_en2" },
> > +	{ .name = "vout_en3" },
> > +	{ .name = "vout_en4" },
> > +	{ .name = "vout_en5" },
> > +	{ .name = "vout_en6" },
> > +	{ .name = "vout_en7" },
> > +};
> > +#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
> > +
> >  static int ltc2978_probe(struct i2c_client *client,
> >  			 const struct i2c_device_id *id)
> >  {
> > @@ -487,6 +513,17 @@ static int ltc2978_probe(struct i2c_client *client,
> >  	default:
> >  		return -ENODEV;
> >  	}
> > +
> > +#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
> > +	info->num_regulators = info->pages;
> > +	info->reg_desc = ltc2978_reg_desc;
> > +	info->reg_matches = ltc2978_reg_matches;
> > +	if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
> > +		dev_err(&client->dev, "num_regulators too large!");
> > +		info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
> > +	}
> > +#endif
> > +
> >  	return pmbus_do_probe(client, id, info);
> >  }
> >  
> > -- 
> > 1.7.9.5
> > 
> 
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